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aha/drivers/scsi/seagate.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1666 lines
46 KiB
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Raw Blame History

/*
* seagate.c Copyright (C) 1992, 1993 Drew Eckhardt
* low level scsi driver for ST01/ST02, Future Domain TMC-885,
* TMC-950 by Drew Eckhardt <drew@colorado.edu>
*
* Note : TMC-880 boards don't work because they have two bits in
* the status register flipped, I'll fix this "RSN"
* [why do I have strong feeling that above message is from 1993? :-)
* pavel@ucw.cz]
*
* This card does all the I/O via memory mapped I/O, so there is no need
* to check or allocate a region of the I/O address space.
*/
/* 1996 - to use new read{b,w,l}, write{b,w,l}, and phys_to_virt
* macros, replaced assembler routines with C. There's probably a
* performance hit, but I only have a cdrom and can't tell. Define
* SEAGATE_USE_ASM if you want the old assembler code -- SJT
*
* 1998-jul-29 - created DPRINTK macros and made it work under
* linux 2.1.112, simplified some #defines etc. <pavel@ucw.cz>
*
* Aug 2000 - aeb - deleted seagate_st0x_biosparam(). It would try to
* read the physical disk geometry, a bad mistake. Of course it doesn't
* matter much what geometry one invents, but on large disks it
* returned 256 (or more) heads, causing all kind of failures.
* Of course this means that people might see a different geometry now,
* so boot parameters may be necessary in some cases.
*/
/*
* Configuration :
* To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE
* -DIRQ will override the default of 5.
* Note: You can now set these options from the kernel's "command line".
* The syntax is:
*
* st0x=ADDRESS,IRQ (for a Seagate controller)
* or:
* tmc8xx=ADDRESS,IRQ (for a TMC-8xx or TMC-950 controller)
* eg:
* tmc8xx=0xC8000,15
*
* will configure the driver for a TMC-8xx style controller using IRQ 15
* with a base address of 0xC8000.
*
* -DARBITRATE
* Will cause the host adapter to arbitrate for the
* bus for better SCSI-II compatibility, rather than just
* waiting for BUS FREE and then doing its thing. Should
* let us do one command per Lun when I integrate my
* reorganization changes into the distribution sources.
*
* -DDEBUG=65535
* Will activate debug code.
*
* -DFAST or -DFAST32
* Will use blind transfers where possible
*
* -DPARITY
* This will enable parity.
*
* -DSEAGATE_USE_ASM
* Will use older seagate assembly code. should be (very small amount)
* Faster.
*
* -DSLOW_RATE=50
* Will allow compatibility with broken devices that don't
* handshake fast enough (ie, some CD ROM's) for the Seagate
* code.
*
* 50 is some number, It will let you specify a default
* transfer rate if handshaking isn't working correctly.
*
* -DOLDCNTDATASCEME There is a new sceme to set the CONTROL
* and DATA reigsters which complies more closely
* with the SCSI2 standard. This hopefully eliminates
* the need to swap the order these registers are
* 'messed' with. It makes the following two options
* obsolete. To reenable the old sceme define this.
*
* The following to options are patches from the SCSI.HOWTO
*
* -DSWAPSTAT This will swap the definitions for STAT_MSG and STAT_CD.
*
* -DSWAPCNTDATA This will swap the order that seagate.c messes with
* the CONTROL an DATA registers.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#ifdef DEBUG
#define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0)
#else
#define DPRINTK( when, msg... ) do { } while (0)
#endif
#define DANY( msg... ) DPRINTK( 0xffff, msg );
#ifndef IRQ
#define IRQ 5
#endif
#ifdef FAST32
#define FAST
#endif
#undef LINKED /* Linked commands are currently broken! */
#if defined(OVERRIDE) && !defined(CONTROLLER)
#error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type
#endif
#ifndef __i386__
#undef SEAGATE_USE_ASM
#endif
/*
Thanks to Brian Antoine for the example code in his Messy-Loss ST-01
driver, and Mitsugu Suzuki for information on the ST-01
SCSI host.
*/
/*
CONTROL defines
*/
#define CMD_RST 0x01
#define CMD_SEL 0x02
#define CMD_BSY 0x04
#define CMD_ATTN 0x08
#define CMD_START_ARB 0x10
#define CMD_EN_PARITY 0x20
#define CMD_INTR 0x40
#define CMD_DRVR_ENABLE 0x80
/*
STATUS
*/
#ifdef SWAPSTAT
#define STAT_MSG 0x08
#define STAT_CD 0x02
#else
#define STAT_MSG 0x02
#define STAT_CD 0x08
#endif
#define STAT_BSY 0x01
#define STAT_IO 0x04
#define STAT_REQ 0x10
#define STAT_SEL 0x20
#define STAT_PARITY 0x40
#define STAT_ARB_CMPL 0x80
/*
REQUESTS
*/
#define REQ_MASK (STAT_CD | STAT_IO | STAT_MSG)
#define REQ_DATAOUT 0
#define REQ_DATAIN STAT_IO
#define REQ_CMDOUT STAT_CD
#define REQ_STATIN (STAT_CD | STAT_IO)
#define REQ_MSGOUT (STAT_MSG | STAT_CD)
#define REQ_MSGIN (STAT_MSG | STAT_CD | STAT_IO)
extern volatile int seagate_st0x_timeout;
#ifdef PARITY
#define BASE_CMD CMD_EN_PARITY
#else
#define BASE_CMD 0
#endif
/*
Debugging code
*/
#define PHASE_BUS_FREE 1
#define PHASE_ARBITRATION 2
#define PHASE_SELECTION 4
#define PHASE_DATAIN 8
#define PHASE_DATAOUT 0x10
#define PHASE_CMDOUT 0x20
#define PHASE_MSGIN 0x40
#define PHASE_MSGOUT 0x80
#define PHASE_STATUSIN 0x100
#define PHASE_ETC (PHASE_DATAIN | PHASE_DATAOUT | PHASE_CMDOUT | PHASE_MSGIN | PHASE_MSGOUT | PHASE_STATUSIN)
#define PRINT_COMMAND 0x200
#define PHASE_EXIT 0x400
#define PHASE_RESELECT 0x800
#define DEBUG_FAST 0x1000
#define DEBUG_SG 0x2000
#define DEBUG_LINKED 0x4000
#define DEBUG_BORKEN 0x8000
/*
* Control options - these are timeouts specified in .01 seconds.
*/
/* 30, 20 work */
#define ST0X_BUS_FREE_DELAY 25
#define ST0X_SELECTION_DELAY 25
#define SEAGATE 1 /* these determine the type of the controller */
#define FD 2
#define ST0X_ID_STR "Seagate ST-01/ST-02"
#define FD_ID_STR "TMC-8XX/TMC-950"
static int internal_command (unsigned char target, unsigned char lun,
const void *cmnd,
void *buff, int bufflen, int reselect);
static int incommand; /* set if arbitration has finished
and we are in some command phase. */
static unsigned int base_address = 0; /* Where the card ROM starts, used to
calculate memory mapped register
location. */
static void __iomem *st0x_cr_sr; /* control register write, status
register read. 256 bytes in
length.
Read is status of SCSI BUS, as per
STAT masks. */
static void __iomem *st0x_dr; /* data register, read write 256
bytes in length. */
static volatile int st0x_aborted = 0; /* set when we are aborted, ie by a
time out, etc. */
static unsigned char controller_type = 0; /* set to SEAGATE for ST0x
boards or FD for TMC-8xx
boards */
static int irq = IRQ;
module_param(base_address, uint, 0);
module_param(controller_type, byte, 0);
module_param(irq, int, 0);
MODULE_LICENSE("GPL");
#define retcode(result) (((result) << 16) | (message << 8) | status)
#define STATUS ((u8) readb(st0x_cr_sr))
#define DATA ((u8) readb(st0x_dr))
#define WRITE_CONTROL(d) { writeb((d), st0x_cr_sr); }
#define WRITE_DATA(d) { writeb((d), st0x_dr); }
#ifndef OVERRIDE
static unsigned int seagate_bases[] = {
0xc8000, 0xca000, 0xcc000,
0xce000, 0xdc000, 0xde000
};
typedef struct {
const unsigned char *signature;
unsigned offset;
unsigned length;
unsigned char type;
} Signature;
static Signature __initdata signatures[] = {
{"ST01 v1.7 (C) Copyright 1987 Seagate", 15, 37, SEAGATE},
{"SCSI BIOS 2.00 (C) Copyright 1987 Seagate", 15, 40, SEAGATE},
/*
* The following two lines are NOT mistakes. One detects ROM revision
* 3.0.0, the other 3.2. Since seagate has only one type of SCSI adapter,
* and this is not going to change, the "SEAGATE" and "SCSI" together
* are probably "good enough"
*/
{"SEAGATE SCSI BIOS ", 16, 17, SEAGATE},
{"SEAGATE SCSI BIOS ", 17, 17, SEAGATE},
/*
* However, future domain makes several incompatible SCSI boards, so specific
* signatures must be used.
*/
{"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD},
{"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD},
{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90", 5, 47, FD},
{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90", 5, 47, FD},
{"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD},
{"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92", 5, 44, FD},
{"IBM F1 BIOS V1.1004/30/92", 5, 25, FD},
{"FUTURE DOMAIN TMC-950", 5, 21, FD},
/* Added for 2.2.16 by Matthias_Heidbrink@b.maus.de */
{"IBM F1 V1.2009/22/93", 5, 25, FD},
};
#define NUM_SIGNATURES ARRAY_SIZE(signatures)
#endif /* n OVERRIDE */
/*
* hostno stores the hostnumber, as told to us by the init routine.
*/
static int hostno = -1;
static void seagate_reconnect_intr (int, void *);
static irqreturn_t do_seagate_reconnect_intr (int, void *);
static int seagate_st0x_bus_reset(struct scsi_cmnd *);
#ifdef FAST
static int fast = 1;
#else
#define fast 0
#endif
#ifdef SLOW_RATE
/*
* Support for broken devices :
* The Seagate board has a handshaking problem. Namely, a lack
* thereof for slow devices. You can blast 600K/second through
* it if you are polling for each byte, more if you do a blind
* transfer. In the first case, with a fast device, REQ will
* transition high-low or high-low-high before your loop restarts
* and you'll have no problems. In the second case, the board
* will insert wait states for up to 13.2 usecs for REQ to
* transition low->high, and everything will work.
*
* However, there's nothing in the state machine that says
* you *HAVE* to see a high-low-high set of transitions before
* sending the next byte, and slow things like the Trantor CD ROMS
* will break because of this.
*
* So, we need to slow things down, which isn't as simple as it
* seems. We can't slow things down period, because then people
* who don't recompile their kernels will shoot me for ruining
* their performance. We need to do it on a case per case basis.
*
* The best for performance will be to, only for borken devices
* (this is stored on a per-target basis in the scsi_devices array)
*
* Wait for a low->high transition before continuing with that
* transfer. If we timeout, continue anyways. We don't need
* a long timeout, because REQ should only be asserted until the
* corresponding ACK is received and processed.
*
* Note that we can't use the system timer for this, because of
* resolution, and we *really* can't use the timer chip since
* gettimeofday() and the beeper routines use that. So,
* the best thing for us to do will be to calibrate a timing
* loop in the initialization code using the timer chip before
* gettimeofday() can screw with it.
*
* FIXME: this is broken (not borken :-). Empty loop costs less than
* loop with ISA access in it! -- pavel@ucw.cz
*/
static int borken_calibration = 0;
static void __init borken_init (void)
{
register int count = 0, start = jiffies + 1, stop = start + 25;
/* FIXME: There may be a better approach, this is a straight port for
now */
preempt_disable();
while (time_before (jiffies, start))
cpu_relax();
for (; time_before (jiffies, stop); ++count)
cpu_relax();
preempt_enable();
/*
* Ok, we now have a count for .25 seconds. Convert to a
* count per second and divide by transfer rate in K. */
borken_calibration = (count * 4) / (SLOW_RATE * 1024);
if (borken_calibration < 1)
borken_calibration = 1;
}
static inline void borken_wait (void)
{
register int count;
for (count = borken_calibration; count && (STATUS & STAT_REQ); --count)
cpu_relax();
#if (DEBUG & DEBUG_BORKEN)
if (count)
printk ("scsi%d : borken timeout\n", hostno);
#endif
}
#endif /* def SLOW_RATE */
/* These beasts only live on ISA, and ISA means 8MHz. Each ULOOP()
* contains at least one ISA access, which takes more than 0.125
* usec. So if we loop 8 times time in usec, we are safe.
*/
#define ULOOP( i ) for (clock = i*8;;)
#define TIMEOUT (!(clock--))
int __init seagate_st0x_detect (struct scsi_host_template * tpnt)
{
struct Scsi_Host *instance;
int i, j;
unsigned long cr, dr;
tpnt->proc_name = "seagate";
/*
* First, we try for the manual override.
*/
DANY ("Autodetecting ST0x / TMC-8xx\n");
if (hostno != -1) {
printk (KERN_ERR "seagate_st0x_detect() called twice?!\n");
return 0;
}
/* If the user specified the controller type from the command line,
controller_type will be non-zero, so don't try to detect one */
if (!controller_type) {
#ifdef OVERRIDE
base_address = OVERRIDE;
controller_type = CONTROLLER;
DANY ("Base address overridden to %x, controller type is %s\n",
base_address,
controller_type == SEAGATE ? "SEAGATE" : "FD");
#else /* OVERRIDE */
/*
* To detect this card, we simply look for the signature
* from the BIOS version notice in all the possible locations
* of the ROM's. This has a nice side effect of not trashing
* any register locations that might be used by something else.
*
* XXX - note that we probably should be probing the address
* space for the on-board RAM instead.
*/
for (i = 0; i < ARRAY_SIZE(seagate_bases); ++i) {
void __iomem *p = ioremap(seagate_bases[i], 0x2000);
if (!p)
continue;
for (j = 0; j < NUM_SIGNATURES; ++j)
if (check_signature(p + signatures[j].offset, signatures[j].signature, signatures[j].length)) {
base_address = seagate_bases[i];
controller_type = signatures[j].type;
break;
}
iounmap(p);
}
#endif /* OVERRIDE */
}
/* (! controller_type) */
tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6;
tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR;
if (!base_address) {
printk(KERN_INFO "seagate: ST0x/TMC-8xx not detected.\n");
return 0;
}
cr = base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00);
dr = cr + 0x200;
st0x_cr_sr = ioremap(cr, 0x100);
st0x_dr = ioremap(dr, 0x100);
DANY("%s detected. Base address = %x, cr = %x, dr = %x\n",
tpnt->name, base_address, cr, dr);
/*
* At all times, we will use IRQ 5. Should also check for IRQ3
* if we lose our first interrupt.
*/
instance = scsi_register (tpnt, 0);
if (instance == NULL)
return 0;
hostno = instance->host_no;
if (request_irq (irq, do_seagate_reconnect_intr, IRQF_DISABLED, (controller_type == SEAGATE) ? "seagate" : "tmc-8xx", instance)) {
printk(KERN_ERR "scsi%d : unable to allocate IRQ%d\n", hostno, irq);
return 0;
}
instance->irq = irq;
instance->io_port = base_address;
#ifdef SLOW_RATE
printk(KERN_INFO "Calibrating borken timer... ");
borken_init();
printk(" %d cycles per transfer\n", borken_calibration);
#endif
printk (KERN_INFO "This is one second... ");
{
int clock;
ULOOP (1 * 1000 * 1000) {
STATUS;
if (TIMEOUT)
break;
}
}
printk ("done, %s options:"
#ifdef ARBITRATE
" ARBITRATE"
#endif
#ifdef DEBUG
" DEBUG"
#endif
#ifdef FAST
" FAST"
#ifdef FAST32
"32"
#endif
#endif
#ifdef LINKED
" LINKED"
#endif
#ifdef PARITY
" PARITY"
#endif
#ifdef SEAGATE_USE_ASM
" SEAGATE_USE_ASM"
#endif
#ifdef SLOW_RATE
" SLOW_RATE"
#endif
#ifdef SWAPSTAT
" SWAPSTAT"
#endif
#ifdef SWAPCNTDATA
" SWAPCNTDATA"
#endif
"\n", tpnt->name);
return 1;
}
static const char *seagate_st0x_info (struct Scsi_Host *shpnt)
{
static char buffer[64];
snprintf(buffer, 64, "%s at irq %d, address 0x%05X",
(controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR,
irq, base_address);
return buffer;
}
/*
* These are our saved pointers for the outstanding command that is
* waiting for a reconnect
*/
static unsigned char current_target, current_lun;
static unsigned char *current_cmnd, *current_data;
static int current_nobuffs;
static struct scatterlist *current_buffer;
static int current_bufflen;
#ifdef LINKED
/*
* linked_connected indicates whether or not we are currently connected to
* linked_target, linked_lun and in an INFORMATION TRANSFER phase,
* using linked commands.
*/
static int linked_connected = 0;
static unsigned char linked_target, linked_lun;
#endif
static void (*done_fn) (struct scsi_cmnd *) = NULL;
static struct scsi_cmnd *SCint = NULL;
/*
* These control whether or not disconnect / reconnect will be attempted,
* or are being attempted.
*/
#define NO_RECONNECT 0
#define RECONNECT_NOW 1
#define CAN_RECONNECT 2
/*
* LINKED_RIGHT indicates that we are currently connected to the correct target
* for this command, LINKED_WRONG indicates that we are connected to the wrong
* target. Note that these imply CAN_RECONNECT and require defined(LINKED).
*/
#define LINKED_RIGHT 3
#define LINKED_WRONG 4
/*
* This determines if we are expecting to reconnect or not.
*/
static int should_reconnect = 0;
/*
* The seagate_reconnect_intr routine is called when a target reselects the
* host adapter. This occurs on the interrupt triggered by the target
* asserting SEL.
*/
static irqreturn_t do_seagate_reconnect_intr(int irq, void *dev_id)
{
unsigned long flags;
struct Scsi_Host *dev = dev_id;
spin_lock_irqsave (dev->host_lock, flags);
seagate_reconnect_intr (irq, dev_id);
spin_unlock_irqrestore (dev->host_lock, flags);
return IRQ_HANDLED;
}
static void seagate_reconnect_intr (int irq, void *dev_id)
{
int temp;
struct scsi_cmnd *SCtmp;
DPRINTK (PHASE_RESELECT, "scsi%d : seagate_reconnect_intr() called\n", hostno);
if (!should_reconnect)
printk(KERN_WARNING "scsi%d: unexpected interrupt.\n", hostno);
else {
should_reconnect = 0;
DPRINTK (PHASE_RESELECT, "scsi%d : internal_command(%d, %08x, %08x, RECONNECT_NOW\n",
hostno, current_target, current_data, current_bufflen);
temp = internal_command (current_target, current_lun, current_cmnd, current_data, current_bufflen, RECONNECT_NOW);
if (msg_byte(temp) != DISCONNECT) {
if (done_fn) {
DPRINTK(PHASE_RESELECT, "scsi%d : done_fn(%d,%08x)", hostno, hostno, temp);
if (!SCint)
panic ("SCint == NULL in seagate");
SCtmp = SCint;
SCint = NULL;
SCtmp->result = temp;
done_fn(SCtmp);
} else
printk(KERN_ERR "done_fn() not defined.\n");
}
}
}
/*
* The seagate_st0x_queue_command() function provides a queued interface
* to the seagate SCSI driver. Basically, it just passes control onto the
* seagate_command() function, after fixing it so that the done_fn()
* is set to the one passed to the function. We have to be very careful,
* because there are some commands on some devices that do not disconnect,
* and if we simply call the done_fn when the command is done then another
* command is started and queue_command is called again... We end up
* overflowing the kernel stack, and this tends not to be such a good idea.
*/
static int recursion_depth = 0;
static int seagate_st0x_queue_command(struct scsi_cmnd * SCpnt,
void (*done) (struct scsi_cmnd *))
{
int result, reconnect;
struct scsi_cmnd *SCtmp;
DANY ("seagate: que_command");
done_fn = done;
current_target = SCpnt->device->id;
current_lun = SCpnt->device->lun;
current_cmnd = SCpnt->cmnd;
current_data = (unsigned char *) SCpnt->request_buffer;
current_bufflen = SCpnt->request_bufflen;
SCint = SCpnt;
if (recursion_depth)
return 1;
recursion_depth++;
do {
#ifdef LINKED
/*
* Set linked command bit in control field of SCSI command.
*/
current_cmnd[SCpnt->cmd_len] |= 0x01;
if (linked_connected) {
DPRINTK (DEBUG_LINKED, "scsi%d : using linked commands, current I_T_L nexus is ", hostno);
if (linked_target == current_target && linked_lun == current_lun)
{
DPRINTK(DEBUG_LINKED, "correct\n");
reconnect = LINKED_RIGHT;
} else {
DPRINTK(DEBUG_LINKED, "incorrect\n");
reconnect = LINKED_WRONG;
}
} else
#endif /* LINKED */
reconnect = CAN_RECONNECT;
result = internal_command(SCint->device->id, SCint->device->lun, SCint->cmnd,
SCint->request_buffer, SCint->request_bufflen, reconnect);
if (msg_byte(result) == DISCONNECT)
break;
SCtmp = SCint;
SCint = NULL;
SCtmp->result = result;
done_fn(SCtmp);
}
while (SCint);
recursion_depth--;
return 0;
}
static int internal_command (unsigned char target, unsigned char lun,
const void *cmnd, void *buff, int bufflen, int reselect)
{
unsigned char *data = NULL;
struct scatterlist *buffer = NULL;
int clock, temp, nobuffs = 0, done = 0, len = 0;
#ifdef DEBUG
int transfered = 0, phase = 0, newphase;
#endif
register unsigned char status_read;
unsigned char tmp_data, tmp_control, status = 0, message = 0;
unsigned transfersize = 0, underflow = 0;
#ifdef SLOW_RATE
int borken = (int) SCint->device->borken; /* Does the current target require
Very Slow I/O ? */
#endif
incommand = 0;
st0x_aborted = 0;
#if (DEBUG & PRINT_COMMAND)
printk("scsi%d : target = %d, command = ", hostno, target);
__scsi_print_command((unsigned char *) cmnd);
#endif
#if (DEBUG & PHASE_RESELECT)
switch (reselect) {
case RECONNECT_NOW:
printk("scsi%d : reconnecting\n", hostno);
break;
#ifdef LINKED
case LINKED_RIGHT:
printk("scsi%d : connected, can reconnect\n", hostno);
break;
case LINKED_WRONG:
printk("scsi%d : connected to wrong target, can reconnect\n",
hostno);
break;
#endif
case CAN_RECONNECT:
printk("scsi%d : allowed to reconnect\n", hostno);
break;
default:
printk("scsi%d : not allowed to reconnect\n", hostno);
}
#endif
if (target == (controller_type == SEAGATE ? 7 : 6))
return DID_BAD_TARGET;
/*
* We work it differently depending on if this is is "the first time,"
* or a reconnect. If this is a reselect phase, then SEL will
* be asserted, and we must skip selection / arbitration phases.
*/
switch (reselect) {
case RECONNECT_NOW:
DPRINTK (PHASE_RESELECT, "scsi%d : phase RESELECT \n", hostno);
/*
* At this point, we should find the logical or of our ID
* and the original target's ID on the BUS, with BSY, SEL,
* and I/O signals asserted.
*
* After ARBITRATION phase is completed, only SEL, BSY,
* and the target ID are asserted. A valid initiator ID
* is not on the bus until IO is asserted, so we must wait
* for that.
*/
ULOOP (100 * 1000) {
temp = STATUS;
if ((temp & STAT_IO) && !(temp & STAT_BSY))
break;
if (TIMEOUT) {
DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for IO .\n", hostno);
return (DID_BAD_INTR << 16);
}
}
/*
* After I/O is asserted by the target, we can read our ID
* and its ID off of the BUS.
*/
if (!((temp = DATA) & (controller_type == SEAGATE ? 0x80 : 0x40))) {
DPRINTK (PHASE_RESELECT, "scsi%d : detected reconnect request to different target.\n\tData bus = %d\n", hostno, temp);
return (DID_BAD_INTR << 16);
}
if (!(temp & (1 << current_target))) {
printk(KERN_WARNING "scsi%d : Unexpected reselect interrupt. Data bus = %d\n", hostno, temp);
return (DID_BAD_INTR << 16);
}
buffer = current_buffer;
cmnd = current_cmnd; /* WDE add */
data = current_data; /* WDE add */
len = current_bufflen; /* WDE add */
nobuffs = current_nobuffs;
/*
* We have determined that we have been selected. At this
* point, we must respond to the reselection by asserting
* BSY ourselves
*/
#if 1
WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | CMD_BSY);
#else
WRITE_CONTROL (BASE_CMD | CMD_BSY);
#endif
/*
* The target will drop SEL, and raise BSY, at which time
* we must drop BSY.
*/
ULOOP (100 * 1000) {
if (!(STATUS & STAT_SEL))
break;
if (TIMEOUT) {
WRITE_CONTROL (BASE_CMD | CMD_INTR);
DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for SEL.\n", hostno);
return (DID_BAD_INTR << 16);
}
}
WRITE_CONTROL (BASE_CMD);
/*
* At this point, we have connected with the target
* and can get on with our lives.
*/
break;
case CAN_RECONNECT:
#ifdef LINKED
/*
* This is a bletcherous hack, just as bad as the Unix #!
* interpreter stuff. If it turns out we are using the wrong
* I_T_L nexus, the easiest way to deal with it is to go into
* our INFORMATION TRANSFER PHASE code, send a ABORT
* message on MESSAGE OUT phase, and then loop back to here.
*/
connect_loop:
#endif
DPRINTK (PHASE_BUS_FREE, "scsi%d : phase = BUS FREE \n", hostno);
/*
* BUS FREE PHASE
*
* On entry, we make sure that the BUS is in a BUS FREE
* phase, by insuring that both BSY and SEL are low for
* at least one bus settle delay. Several reads help
* eliminate wire glitch.
*/
#ifndef ARBITRATE
#error FIXME: this is broken: we may not use jiffies here - we are under cli(). It will hardlock.
clock = jiffies + ST0X_BUS_FREE_DELAY;
while (((STATUS | STATUS | STATUS) & (STAT_BSY | STAT_SEL)) && (!st0x_aborted) && time_before (jiffies, clock))
cpu_relax();
if (time_after (jiffies, clock))
return retcode (DID_BUS_BUSY);
else if (st0x_aborted)
return retcode (st0x_aborted);
#endif
DPRINTK (PHASE_SELECTION, "scsi%d : phase = SELECTION\n", hostno);
clock = jiffies + ST0X_SELECTION_DELAY;
/*
* Arbitration/selection procedure :
* 1. Disable drivers
* 2. Write HOST adapter address bit
* 3. Set start arbitration.
* 4. We get either ARBITRATION COMPLETE or SELECT at this
* point.
* 5. OR our ID and targets on bus.
* 6. Enable SCSI drivers and asserted SEL and ATTN
*/
#ifdef ARBITRATE
/* FIXME: verify host lock is always held here */
WRITE_CONTROL(0);
WRITE_DATA((controller_type == SEAGATE) ? 0x80 : 0x40);
WRITE_CONTROL(CMD_START_ARB);
ULOOP (ST0X_SELECTION_DELAY * 10000) {
status_read = STATUS;
if (status_read & STAT_ARB_CMPL)
break;
if (st0x_aborted) /* FIXME: What? We are going to do something even after abort? */
break;
if (TIMEOUT || (status_read & STAT_SEL)) {
printk(KERN_WARNING "scsi%d : arbitration lost or timeout.\n", hostno);
WRITE_CONTROL (BASE_CMD);
return retcode (DID_NO_CONNECT);
}
}
DPRINTK (PHASE_SELECTION, "scsi%d : arbitration complete\n", hostno);
#endif
/*
* When the SCSI device decides that we're gawking at it,
* it will respond by asserting BUSY on the bus.
*
* Note : the Seagate ST-01/02 product manual says that we
* should twiddle the DATA register before the control
* register. However, this does not work reliably so we do
* it the other way around.
*
* Probably could be a problem with arbitration too, we
* really should try this with a SCSI protocol or logic
* analyzer to see what is going on.
*/
tmp_data = (unsigned char) ((1 << target) | (controller_type == SEAGATE ? 0x80 : 0x40));
tmp_control = BASE_CMD | CMD_DRVR_ENABLE | CMD_SEL | (reselect ? CMD_ATTN : 0);
/* FIXME: verify host lock is always held here */
#ifdef OLDCNTDATASCEME
#ifdef SWAPCNTDATA
WRITE_CONTROL (tmp_control);
WRITE_DATA (tmp_data);
#else
WRITE_DATA (tmp_data);
WRITE_CONTROL (tmp_control);
#endif
#else
tmp_control ^= CMD_BSY; /* This is guesswork. What used to be in driver */
WRITE_CONTROL (tmp_control); /* could never work: it sent data into control */
WRITE_DATA (tmp_data); /* register and control info into data. Hopefully */
tmp_control ^= CMD_BSY; /* fixed, but order of first two may be wrong. */
WRITE_CONTROL (tmp_control); /* -- pavel@ucw.cz */
#endif
ULOOP (250 * 1000) {
if (st0x_aborted) {
/*
* If we have been aborted, and we have a
* command in progress, IE the target
* still has BSY asserted, then we will
* reset the bus, and notify the midlevel
* driver to expect sense.
*/
WRITE_CONTROL (BASE_CMD);
if (STATUS & STAT_BSY) {
printk(KERN_WARNING "scsi%d : BST asserted after we've been aborted.\n", hostno);
seagate_st0x_bus_reset(NULL);
return retcode (DID_RESET);
}
return retcode (st0x_aborted);
}
if (STATUS & STAT_BSY)
break;
if (TIMEOUT) {
DPRINTK (PHASE_SELECTION, "scsi%d : NO CONNECT with target %d, stat = %x \n", hostno, target, STATUS);
return retcode (DID_NO_CONNECT);
}
}
/* Establish current pointers. Take into account scatter / gather */
if ((nobuffs = SCint->use_sg)) {
#if (DEBUG & DEBUG_SG)
{
int i;
printk("scsi%d : scatter gather requested, using %d buffers.\n", hostno, nobuffs);
for (i = 0; i < nobuffs; ++i)
printk("scsi%d : buffer %d address = %p length = %d\n",
hostno, i,
page_address(buffer[i].page) + buffer[i].offset,
buffer[i].length);
}
#endif
buffer = (struct scatterlist *) SCint->request_buffer;
len = buffer->length;
data = page_address(buffer->page) + buffer->offset;
} else {
DPRINTK (DEBUG_SG, "scsi%d : scatter gather not requested.\n", hostno);
buffer = NULL;
len = SCint->request_bufflen;
data = (unsigned char *) SCint->request_buffer;
}
DPRINTK (PHASE_DATAIN | PHASE_DATAOUT, "scsi%d : len = %d\n",
hostno, len);
break;
#ifdef LINKED
case LINKED_RIGHT:
break;
case LINKED_WRONG:
break;
#endif
} /* end of switch(reselect) */
/*
* There are several conditions under which we wish to send a message :
* 1. When we are allowing disconnect / reconnect, and need to
* establish the I_T_L nexus via an IDENTIFY with the DiscPriv bit
* set.
*
* 2. When we are doing linked commands, are have the wrong I_T_L
* nexus established and want to send an ABORT message.
*/
/* GCC does not like an ifdef inside a macro, so do it the hard way. */
#ifdef LINKED
WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT)|| (reselect == LINKED_WRONG))? CMD_ATTN : 0));
#else
WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT))? CMD_ATTN : 0));
#endif
/*
* INFORMATION TRANSFER PHASE
*
* The nasty looking read / write inline assembler loops we use for
* DATAIN and DATAOUT phases are approximately 4-5 times as fast as
* the 'C' versions - since we're moving 1024 bytes of data, this
* really adds up.
*
* SJT: The nasty-looking assembler is gone, so it's slower.
*
*/
DPRINTK (PHASE_ETC, "scsi%d : phase = INFORMATION TRANSFER\n", hostno);
incommand = 1;
transfersize = SCint->transfersize;
underflow = SCint->underflow;
/*
* Now, we poll the device for status information,
* and handle any requests it makes. Note that since we are unsure
* of how much data will be flowing across the system, etc and
* cannot make reasonable timeouts, that we will instead have the
* midlevel driver handle any timeouts that occur in this phase.
*/
while (((status_read = STATUS) & STAT_BSY) && !st0x_aborted && !done) {
#ifdef PARITY
if (status_read & STAT_PARITY) {
printk(KERN_ERR "scsi%d : got parity error\n", hostno);
st0x_aborted = DID_PARITY;
}
#endif
if (status_read & STAT_REQ) {
#if ((DEBUG & PHASE_ETC) == PHASE_ETC)
if ((newphase = (status_read & REQ_MASK)) != phase) {
phase = newphase;
switch (phase) {
case REQ_DATAOUT:
printk ("scsi%d : phase = DATA OUT\n", hostno);
break;
case REQ_DATAIN:
printk ("scsi%d : phase = DATA IN\n", hostno);
break;
case REQ_CMDOUT:
printk
("scsi%d : phase = COMMAND OUT\n", hostno);
break;
case REQ_STATIN:
printk ("scsi%d : phase = STATUS IN\n", hostno);
break;
case REQ_MSGOUT:
printk
("scsi%d : phase = MESSAGE OUT\n", hostno);
break;
case REQ_MSGIN:
printk ("scsi%d : phase = MESSAGE IN\n", hostno);
break;
default:
printk ("scsi%d : phase = UNKNOWN\n", hostno);
st0x_aborted = DID_ERROR;
}
}
#endif
switch (status_read & REQ_MASK) {
case REQ_DATAOUT:
/*
* If we are in fast mode, then we simply splat
* the data out in word-sized chunks as fast as
* we can.
*/
if (!len) {
#if 0
printk("scsi%d: underflow to target %d lun %d \n", hostno, target, lun);
st0x_aborted = DID_ERROR;
fast = 0;
#endif
break;
}
if (fast && transfersize
&& !(len % transfersize)
&& (len >= transfersize)
#ifdef FAST32
&& !(transfersize % 4)
#endif
) {
DPRINTK (DEBUG_FAST,
"scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
" len = %d, data = %08x\n",
hostno, SCint->underflow,
SCint->transfersize, len,
data);
/* SJT: Start. Fast Write */
#ifdef SEAGATE_USE_ASM
__asm__ ("cld\n\t"
#ifdef FAST32
"shr $2, %%ecx\n\t"
"1:\t"
"lodsl\n\t"
"movl %%eax, (%%edi)\n\t"
#else
"1:\t"
"lodsb\n\t"
"movb %%al, (%%edi)\n\t"
#endif
"loop 1b;"
/* output */ :
/* input */ :"D" (st0x_dr),
"S"
(data),
"c" (SCint->transfersize)
/* clobbered */
: "eax", "ecx",
"esi");
#else /* SEAGATE_USE_ASM */
memcpy_toio(st0x_dr, data, transfersize);
#endif /* SEAGATE_USE_ASM */
/* SJT: End */
len -= transfersize;
data += transfersize;
DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
} else {
/*
* We loop as long as we are in a
* data out phase, there is data to
* send, and BSY is still active.
*/
/* SJT: Start. Slow Write. */
#ifdef SEAGATE_USE_ASM
int __dummy_1, __dummy_2;
/*
* We loop as long as we are in a data out phase, there is data to send,
* and BSY is still active.
*/
/* Local variables : len = ecx , data = esi,
st0x_cr_sr = ebx, st0x_dr = edi
*/
__asm__ (
/* Test for any data here at all. */
"orl %%ecx, %%ecx\n\t"
"jz 2f\n\t" "cld\n\t"
/* "movl st0x_cr_sr, %%ebx\n\t" */
/* "movl st0x_dr, %%edi\n\t" */
"1:\t"
"movb (%%ebx), %%al\n\t"
/* Test for BSY */
"test $1, %%al\n\t"
"jz 2f\n\t"
/* Test for data out phase - STATUS & REQ_MASK should be
REQ_DATAOUT, which is 0. */
"test $0xe, %%al\n\t"
"jnz 2f\n\t"
/* Test for REQ */
"test $0x10, %%al\n\t"
"jz 1b\n\t"
"lodsb\n\t"
"movb %%al, (%%edi)\n\t"
"loop 1b\n\t" "2:\n"
/* output */ :"=S" (data), "=c" (len),
"=b"
(__dummy_1),
"=D" (__dummy_2)
/* input */
: "0" (data), "1" (len),
"2" (st0x_cr_sr),
"3" (st0x_dr)
/* clobbered */
: "eax");
#else /* SEAGATE_USE_ASM */
while (len) {
unsigned char stat;
stat = STATUS;
if (!(stat & STAT_BSY)
|| ((stat & REQ_MASK) !=
REQ_DATAOUT))
break;
if (stat & STAT_REQ) {
WRITE_DATA (*data++);
--len;
}
}
#endif /* SEAGATE_USE_ASM */
/* SJT: End. */
}
if (!len && nobuffs) {
--nobuffs;
++buffer;
len = buffer->length;
data = page_address(buffer->page) + buffer->offset;
DPRINTK (DEBUG_SG,
"scsi%d : next scatter-gather buffer len = %d address = %08x\n",
hostno, len, data);
}
break;
case REQ_DATAIN:
#ifdef SLOW_RATE
if (borken) {
#if (DEBUG & (PHASE_DATAIN))
transfered += len;
#endif
for (; len && (STATUS & (REQ_MASK | STAT_REQ)) == (REQ_DATAIN | STAT_REQ); --len) {
*data++ = DATA;
borken_wait();
}
#if (DEBUG & (PHASE_DATAIN))
transfered -= len;
#endif
} else
#endif
if (fast && transfersize
&& !(len % transfersize)
&& (len >= transfersize)
#ifdef FAST32
&& !(transfersize % 4)
#endif
) {
DPRINTK (DEBUG_FAST,
"scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
" len = %d, data = %08x\n",
hostno, SCint->underflow,
SCint->transfersize, len,
data);
/* SJT: Start. Fast Read */
#ifdef SEAGATE_USE_ASM
__asm__ ("cld\n\t"
#ifdef FAST32
"shr $2, %%ecx\n\t"
"1:\t"
"movl (%%esi), %%eax\n\t"
"stosl\n\t"
#else
"1:\t"
"movb (%%esi), %%al\n\t"
"stosb\n\t"
#endif
"loop 1b\n\t"
/* output */ :
/* input */ :"S" (st0x_dr),
"D"
(data),
"c" (SCint->transfersize)
/* clobbered */
: "eax", "ecx",
"edi");
#else /* SEAGATE_USE_ASM */
memcpy_fromio(data, st0x_dr, len);
#endif /* SEAGATE_USE_ASM */
/* SJT: End */
len -= transfersize;
data += transfersize;
#if (DEBUG & PHASE_DATAIN)
printk ("scsi%d: transfered += %d\n", hostno, transfersize);
transfered += transfersize;
#endif
DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
} else {
#if (DEBUG & PHASE_DATAIN)
printk ("scsi%d: transfered += %d\n", hostno, len);
transfered += len; /* Assume we'll transfer it all, then
subtract what we *didn't* transfer */
#endif
/*
* We loop as long as we are in a data in phase, there is room to read,
* and BSY is still active
*/
/* SJT: Start. */
#ifdef SEAGATE_USE_ASM
int __dummy_3, __dummy_4;
/* Dummy clobbering variables for the new gcc-2.95 */
/*
* We loop as long as we are in a data in phase, there is room to read,
* and BSY is still active
*/
/* Local variables : ecx = len, edi = data
esi = st0x_cr_sr, ebx = st0x_dr */
__asm__ (
/* Test for room to read */
"orl %%ecx, %%ecx\n\t"
"jz 2f\n\t" "cld\n\t"
/* "movl st0x_cr_sr, %%esi\n\t" */
/* "movl st0x_dr, %%ebx\n\t" */
"1:\t"
"movb (%%esi), %%al\n\t"
/* Test for BSY */
"test $1, %%al\n\t"
"jz 2f\n\t"
/* Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN,
= STAT_IO, which is 4. */
"movb $0xe, %%ah\n\t"
"andb %%al, %%ah\n\t"
"cmpb $0x04, %%ah\n\t"
"jne 2f\n\t"
/* Test for REQ */
"test $0x10, %%al\n\t"
"jz 1b\n\t"
"movb (%%ebx), %%al\n\t"
"stosb\n\t"
"loop 1b\n\t" "2:\n"
/* output */ :"=D" (data), "=c" (len),
"=S"
(__dummy_3),
"=b" (__dummy_4)
/* input */
: "0" (data), "1" (len),
"2" (st0x_cr_sr),
"3" (st0x_dr)
/* clobbered */
: "eax");
#else /* SEAGATE_USE_ASM */
while (len) {
unsigned char stat;
stat = STATUS;
if (!(stat & STAT_BSY)
|| ((stat & REQ_MASK) !=
REQ_DATAIN))
break;
if (stat & STAT_REQ) {
*data++ = DATA;
--len;
}
}
#endif /* SEAGATE_USE_ASM */
/* SJT: End. */
#if (DEBUG & PHASE_DATAIN)
printk ("scsi%d: transfered -= %d\n", hostno, len);
transfered -= len; /* Since we assumed all of Len got *
transfered, correct our mistake */
#endif
}
if (!len && nobuffs) {
--nobuffs;
++buffer;
len = buffer->length;
data = page_address(buffer->page) + buffer->offset;
DPRINTK (DEBUG_SG, "scsi%d : next scatter-gather buffer len = %d address = %08x\n", hostno, len, data);
}
break;
case REQ_CMDOUT:
while (((status_read = STATUS) & STAT_BSY) &&
((status_read & REQ_MASK) == REQ_CMDOUT))
if (status_read & STAT_REQ) {
WRITE_DATA (*(const unsigned char *) cmnd);
cmnd = 1 + (const unsigned char *)cmnd;
#ifdef SLOW_RATE
if (borken)
borken_wait ();
#endif
}
break;
case REQ_STATIN:
status = DATA;
break;
case REQ_MSGOUT:
/*
* We can only have sent a MSG OUT if we
* requested to do this by raising ATTN.
* So, we must drop ATTN.
*/
WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE);
/*
* If we are reconnecting, then we must
* send an IDENTIFY message in response
* to MSGOUT.
*/
switch (reselect) {
case CAN_RECONNECT:
WRITE_DATA (IDENTIFY (1, lun));
DPRINTK (PHASE_RESELECT | PHASE_MSGOUT, "scsi%d : sent IDENTIFY message.\n", hostno);
break;
#ifdef LINKED
case LINKED_WRONG:
WRITE_DATA (ABORT);
linked_connected = 0;
reselect = CAN_RECONNECT;
goto connect_loop;
DPRINTK (PHASE_MSGOUT | DEBUG_LINKED, "scsi%d : sent ABORT message to cancel incorrect I_T_L nexus.\n", hostno);
#endif /* LINKED */
DPRINTK (DEBUG_LINKED, "correct\n");
default:
WRITE_DATA (NOP);
printk("scsi%d : target %d requested MSGOUT, sent NOP message.\n", hostno, target);
}
break;
case REQ_MSGIN:
switch (message = DATA) {
case DISCONNECT:
DANY("seagate: deciding to disconnect\n");
should_reconnect = 1;
current_data = data; /* WDE add */
current_buffer = buffer;
current_bufflen = len; /* WDE add */
current_nobuffs = nobuffs;
#ifdef LINKED
linked_connected = 0;
#endif
done = 1;
DPRINTK ((PHASE_RESELECT | PHASE_MSGIN), "scsi%d : disconnected.\n", hostno);
break;
#ifdef LINKED
case LINKED_CMD_COMPLETE:
case LINKED_FLG_CMD_COMPLETE:
#endif
case COMMAND_COMPLETE:
/*
* Note : we should check for underflow here.
*/
DPRINTK(PHASE_MSGIN, "scsi%d : command complete.\n", hostno);
done = 1;
break;
case ABORT:
DPRINTK(PHASE_MSGIN, "scsi%d : abort message.\n", hostno);
done = 1;
break;
case SAVE_POINTERS:
current_buffer = buffer;
current_bufflen = len; /* WDE add */
current_data = data; /* WDE mod */
current_nobuffs = nobuffs;
DPRINTK (PHASE_MSGIN, "scsi%d : pointers saved.\n", hostno);
break;
case RESTORE_POINTERS:
buffer = current_buffer;
cmnd = current_cmnd;
data = current_data; /* WDE mod */
len = current_bufflen;
nobuffs = current_nobuffs;
DPRINTK(PHASE_MSGIN, "scsi%d : pointers restored.\n", hostno);
break;
default:
/*
* IDENTIFY distinguishes itself
* from the other messages by
* setting the high bit.
*
* Note : we need to handle at
* least one outstanding command
* per LUN, and need to hash the
* SCSI command for that I_T_L
* nexus based on the known ID
* (at this point) and LUN.
*/
if (message & 0x80) {
DPRINTK (PHASE_MSGIN, "scsi%d : IDENTIFY message received from id %d, lun %d.\n", hostno, target, message & 7);
} else {
/*
* We should go into a
* MESSAGE OUT phase, and
* send a MESSAGE_REJECT
* if we run into a message
* that we don't like. The
* seagate driver needs
* some serious
* restructuring first
* though.
*/
DPRINTK (PHASE_MSGIN, "scsi%d : unknown message %d from target %d.\n", hostno, message, target);
}
}
break;
default:
printk(KERN_ERR "scsi%d : unknown phase.\n", hostno);
st0x_aborted = DID_ERROR;
} /* end of switch (status_read & REQ_MASK) */
#ifdef SLOW_RATE
/*
* I really don't care to deal with borken devices in
* each single byte transfer case (ie, message in,
* message out, status), so I'll do the wait here if
* necessary.
*/
if(borken)
borken_wait();
#endif
} /* if(status_read & STAT_REQ) ends */
} /* while(((status_read = STATUS)...) ends */
DPRINTK(PHASE_DATAIN | PHASE_DATAOUT | PHASE_EXIT, "scsi%d : Transfered %d bytes\n", hostno, transfered);
#if (DEBUG & PHASE_EXIT)
#if 0 /* Doesn't work for scatter/gather */
printk("Buffer : \n");
for(i = 0; i < 20; ++i)
printk("%02x ", ((unsigned char *) data)[i]); /* WDE mod */
printk("\n");
#endif
printk("scsi%d : status = ", hostno);
scsi_print_status(status);
printk(" message = %02x\n", message);
#endif
/* We shouldn't reach this until *after* BSY has been deasserted */
#ifdef LINKED
else
{
/*
* Fix the message byte so that unsuspecting high level drivers
* don't puke when they see a LINKED COMMAND message in place of
* the COMMAND COMPLETE they may be expecting. Shouldn't be
* necessary, but it's better to be on the safe side.
*
* A non LINKED* message byte will indicate that the command
* completed, and we are now disconnected.
*/
switch (message) {
case LINKED_CMD_COMPLETE:
case LINKED_FLG_CMD_COMPLETE:
message = COMMAND_COMPLETE;
linked_target = current_target;
linked_lun = current_lun;
linked_connected = 1;
DPRINTK (DEBUG_LINKED, "scsi%d : keeping I_T_L nexus established for linked command.\n", hostno);
/* We also will need to adjust status to accommodate intermediate
conditions. */
if ((status == INTERMEDIATE_GOOD) || (status == INTERMEDIATE_C_GOOD))
status = GOOD;
break;
/*
* We should also handle what are "normal" termination
* messages here (ABORT, BUS_DEVICE_RESET?, and
* COMMAND_COMPLETE individually, and flake if things
* aren't right.
*/
default:
DPRINTK (DEBUG_LINKED, "scsi%d : closing I_T_L nexus.\n", hostno);
linked_connected = 0;
}
}
#endif /* LINKED */
if (should_reconnect) {
DPRINTK (PHASE_RESELECT, "scsi%d : exiting seagate_st0x_queue_command() with reconnect enabled.\n", hostno);
WRITE_CONTROL (BASE_CMD | CMD_INTR);
} else
WRITE_CONTROL (BASE_CMD);
return retcode (st0x_aborted);
} /* end of internal_command */
static int seagate_st0x_abort(struct scsi_cmnd * SCpnt)
{
st0x_aborted = DID_ABORT;
return SUCCESS;
}
#undef ULOOP
#undef TIMEOUT
/*
* the seagate_st0x_reset function resets the SCSI bus
*
* May be called with SCpnt = NULL
*/
static int seagate_st0x_bus_reset(struct scsi_cmnd * SCpnt)
{
/* No timeouts - this command is going to fail because it was reset. */
DANY ("scsi%d: Reseting bus... ", hostno);
/* assert RESET signal on SCSI bus. */
WRITE_CONTROL (BASE_CMD | CMD_RST);
mdelay (20);
WRITE_CONTROL (BASE_CMD);
st0x_aborted = DID_RESET;
DANY ("done.\n");
return SUCCESS;
}
static int seagate_st0x_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, shost);
release_region(shost->io_port, shost->n_io_port);
return 0;
}
static struct scsi_host_template driver_template = {
.detect = seagate_st0x_detect,
.release = seagate_st0x_release,
.info = seagate_st0x_info,
.queuecommand = seagate_st0x_queue_command,
.eh_abort_handler = seagate_st0x_abort,
.eh_bus_reset_handler = seagate_st0x_bus_reset,
.can_queue = 1,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 1,
.use_clustering = DISABLE_CLUSTERING,
};
#include "scsi_module.c"
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